Selecting the wrong material for a seal is among the most frequently made—and expensive—mistakes made in the design of hydraulic systems. A seal that appears identical to the one shown in a diagram of a part could fail within weeks if the rubber isn't properly matched to the temperature, fluid, and frequency it's exposed to. In the hundreds of seals there are three that are the most popular in the world of hydraulics: NBR, FKM, and PTFE. Each one has its own chemical formula as well as a distinct temperature window as well as a distinct failure mechanism when it is pushed beyond its comfortable zone.
Read more: https://whyps.com/nbr-vs-fkm-vs-ptfe-hydraulic-seals-which-material-fits-your-application
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